jetting for a wr250f

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I guys, i'm totally knew to this forum i discovered it yesterday and it's really nice! i own a wr250f 2007 but it's been only a bit more than a month. The AIS was removed, i want to increase the air flow in the airbox and do some modification to the exhaust that i saw in another post. I do really know a lot about jetting but i know these modification will be useless if i dont jet it.

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Welcome to the site man!! Be sure and do all of the free mods; throttle stop, air box, grey wire, YZ cam timing, exhaust baffle then jet it. As far as the exhaust goes, just replace it with a YZ exhaust. There isn't anything you can do to your stock one to make it flow as well as you need it to and keep it quiet. I removed my baffle and drilled holes in the front baffle but it was still not enough and too loud